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Copper Water Line Gages, And Usage ?
Hello,
Live in a 35 year old house outside of Boston. Had a leak in a Copper water pipe that the plumber finally found. Unfortunately, I forgot to ask him if it was in a hot or cold line, as this might, perhaps, be meaningful ? Anyway, what surprised me was that it was pinhole leak in the middle of a run. Not at a joint or fitting, etc. Right in the middle of a line. Apparently they used the thinnest Copper they could find when they built the place. I used a caliper on it, and found it to be 0.028, which I guess is a grade M (outside diameter of 5/8 inch) But, it still should take the household pressure without any problem, I would think. True ? The plumber replaced it with heavier wall stuff of approx. 0.038, which is probably Type L Questions: a. What might make a pinhole leake in the middle of a clear run ? I guess the pinhole can be considered as a corrosion type of breakthrough. b. How common is something like this is the thinwall Type M tubing ? What causes ? c. 35 years ago, was this (Type M) a common Copper gage they used for household hot and cold water lines ? d. Is it still allowed, or the Code prohibits it now all over ? Any thoughts on this would be most appreciated. Thanks, Bob. |
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